Ocean Thermal Energy

Q.

What is meant by ocean thermal energy ? Explain how ocean thermal energy can be used to generate electricity ?

Q. Write the full form of OTE.

Q.

Ocean thermal energy is due to:

1. Energy stored by waves in the ocean.
2. Temperature difference at different levels in the ocean.
3. Pressure difference at different levels in the ocean.
4. Tides arising out in the ocean.

Q. Why ammonia is used in ocean thermal energy conversion power plants?

1. It is colorless
2. It is a volatile substance
3. It has pungent smell
4. It has strong hydrogen bond

Q.

How is the energy used in everyday life?

Q. To obtain ocean thermal energy, the plants can operate if the minimum temperature difference between water at surface and water at depths up to 2 km is

1. 
   ${40}^{\circ }C$
2. 
   ${60}^{\circ }C$
3. ${80}^{\circ }C$
4. 
   ${20}^{\circ }C$

Q.

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.
(a) Name the form of energy.
(b) Is this energy ultimately derived from the sun or not?
(c) Explain how this form of energy can be converted into electricity.
(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy?

Q.

A burner supplies heat energy at a rate of $434{\mathrm{Js}}^{-1}$ for $60$ seconds when $40\mathrm{g}$ of ice at $0°\mathrm{C}$ changes to water at $75°\mathrm{C}$. Calculate the latent heat of ice.

Q.

Write two forms in which solar energy manifests itself in the sea.

Q.

What is the minimum temperature difference required between the water at surface and 2 km depth to efficiently operate ocean thermal energy conversion plants?

1. 2⁰c

2. 20⁰c

3. 100⁰c

4. no change

Q.

What energy transformation happens in harnessing ocean thermal energy?

1. kinetic energy to electrical energy

2. potential energy to electrical energy

3. chemical energy to electrical energy

4. none of these

Q.

Energy present in the regular rise and fall of ocean water is called______________energy.

Q.

The temperature difference between the upper layers and the deeper layers of the ocean should be ______ to install an OTEC power plant.

1. 40 ^oC

2. 50 ^oC

3. 20 ^oC

4. 30 ^oC

Q.

State limitations of energy that can be harnessed from the sea.

Q.

What is responsible for heating the water at the surface of the ocean more than the water at the depth?

1. Wind

2. Sun

3. Sea Breeze

4. Water Pollution

Q.

The oceans cover almost _________$\%$ of the surface of earth with water and act as a vast collector of __________energy.

1. $71$ , chemical

2. $97$ , solar

3. $71$ , solar

4. $17$ , hydro energy